condition mean min max ZT0-3 18.868041662499998 17.22033328 20.515750045 ZT4-7 21.707631925 19.009539505 24.405724345 ZT8-11 18.9048523875 18.509292369999997 19.300412405 ZT12-15 20.240670424999998 15.248197025 25.233143825 ZT16-19 22.9890545375 19.849781115 26.12832796 ZT20-23 33.983714565 31.879694395 36.087734735